Capital One Financial Corp. ― already in expansion mode in the Richmond region ― can now move forward with a plan to build on at its corporate headquarters property in Tysons Corner. The Fairfax County Board of Supervisors voted unanimously Tuesday in favor of a large, mixed-use project that Capital One had proposed for the financial services company’s 26 acres in Tysons.

According to The Washington Post, the plan, which would take years to build, calls for 3.1 million square feet of office space, four high-rise residential buildings, a hotel, 100,000 square feet of restaurants and retail, parks, playgrounds, parking structures and new streets. The land is located near the McLean station on Metro’s new Silver Line, expected to open late next year.

It’s one of the first major projects to obtain rezoning under a new master plan adopted in 2010 that’s designed to change Tysons from a vehicle-clogged office park into a walkable, urban downtown for Fairfax. Today, about 100,000 people work in Tysons and about 18,000 people live there. Under the master plan, those numbers would change in the future to about 100,000 residents and 200,000 workers by 2050.

In the Richmond area, Capital One is building a $150 million data center in the Meadowville Technology Park in Chesterfield County that should be complete in 2013. The project will create at least 50 new jobs.